
IP geolocation with country, city, coordinates, ISP, timezone and flag data.
ipwhois API is a free Geocoding API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
IP Geolocation and IP Location Lookup Documentation
Details from ipwhois.io.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Free Geolocation tools and APIs for country, region, city and time zone lookup by IP address
Get the IP geolocation data through the simple REST API. All the responses are JSON encoded
IP geolocation with ASN, timezone, currency and threat data, 5,000 keyless calls a day
UK postcode lookup with lat/lon, district, ward, constituency
The ipwhois API is provided by IPWHOIS.io (ipwhois.io). IP Geolocation and IP Location Lookup Documentation
Yes. The ipwhois API is listed in the Geocoding category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The ipwhois API requires no authentication, so you can start making requests without signing up.
Yes. The ipwhois API supports CORS, so front-end JavaScript can call it directly.
Yes. The ipwhois API is served over HTTPS, so it's safe to use in production.